US3374057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for ion exchanging crystalline zeolites with nitrogenous bases
Assignee: WR Grace and Co
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Filing: 1965-09-27
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Granted: 1968-03-19
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Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 Carl V Mcdaniel
- 👤 Philip K Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:05
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; Y; Y10; Y10S; Y10S423/00; Y10S423/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE PROCESS OF NITROGEN BASE EXCHANGE OF SYNTHETIC FAUJASITE HAVING AN ALKALI METAL CONTENT OF LESS THAN 3 PERCENT, EXPRESSED AS THE ALKALI METAL OXIDE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING IN A SOLUTION CONTAINING THE NITROGEN BASE, AN ALUMINUM ION CONCENTRATION GREATER THAN 3 WEIGHT PERCENT, EXPRESSED AS ALUMINUM SULFATE, AND THEREBY PROTECTING THE CRYSTALLINE STRUCTURE OF THE SYNTHETIC FAUJASITE FROM DEGRADATION DURING THE BASE EXCHANGE PROCESS.
Claim 2
Dependent Claim
68 words
IN THE PROCESS OF NITROGEN BASE EXCHANGE OF SYNTHETIC FAUJASITE HAVING AN ALKALI METAL CONTENT OF LESS THAN 3 PERCENT, EXPRESSED AS THE ALKALI METAL OXIDE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING IN A SOLUTION CONTAINING THE NITROGEN BASE, AN ALUMINUM ION CONCENTRATION GREATER THAN 3 WEIGHT PERCENT, EXPRESSED AS ALUMINUM SULFATE, AND THEREBY PROTECTING THE CRYSTALLINE STRUCTURE OF THE SYNTHETIC FAUJASITE FROM DEGRADATION DURING THE BASE EXCHANGE PROCESS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |